Valve-grinder



' R. A. SHANTZ.

VALVE Gammes. APPLICATION FILED" FEB. I9, |920.

Patentedsept. 14,1920.

3 SHEETS-SHEET 2- l MTI.: 1 M k QW @v @m n R. A. SHANTZl VALVE GRINDER.

.LxPPLlcATmN FILED FEs.19.19'2o.

1,352,840, Patented Sept. M, 1920.

a SYHEETIS-SHEET 3.A

yb'. .f YQ 7- 42:2320 R8 a@ A a@ N l f ao '51 f '1S attoluwg carros'ifarss PATENT orare RALPH A. sHAN'ra, or SALEM, onEGoN, `AssIGNoR or1oirEJrnmD To oscar a'.

STEELHAMMER, or SALEM, OREGON, ANDONETHIRD rro JOHN r. sTeELHaM- 1i/IER,OF WOODBURN, OREGON. l

VALVE-Gambian Specification of Iletters Patent. Patentgd Sept. 1d, i929,

Application -iled February 19, 1920. Serial No. 359,835.

Toall whom it may concern lie it known that l, RALPH A; SHANTZ, acitizen of the United States of America, residin at Salem, in the countyof Marion and State of Oregon, have invented certain new and usefulImprovements in Valve- Grinders, of which the following is aspecitication.

My present invention relatesgenerally to valve grinders, and Vmoreparticularly to multiple stem valve grinders adaptable to the grindingof valves in removable cylinder heads as well as in connection'withmotors having removable valve cages, my object being the provision of amachine which will be entirely automatic in its action in respect to theoscillation of the valves on their seats along several limited areaswhich are shifted gradually around the entire circumference of the valveat its seat.

More particularly my invention aiins to provide an arrangement wherebyvalves of. the above classes may be oscillated on their seats, liftedfrom their seats, shifted through a partial rotation, lowered on theirseats, and again oscillated, this operation being repeated until thevalves and their seats are properly ground tight.

lVith 'these objects in mind my invention in its specific aspect,resides in the construction, arrangement and operation of the .sev-

eral parts to be now descrlbedwith respect to the accompanying drawings,which form a part of this specification and in which,

Figure 1 is a side elevation,

Fig. 2 is a sectional top plan View,

Fig. 3 is a horizontal section,

Fig, a is an enlarged side View of the een? tral portion or" the device,

lr ig; 5 is an end view,

Fig. G is any enlarged detail longitudinal vsection through a portion ofth device,

taken along tlie lineof the shaft i/ai Fig. 5, Fig. 7 is a detail faceview oli-one of the cams, and

Fig. 8 is a similar viewr of the other earn. Referring now to theseiigures'my invention proposes a rectangular frame which comprisesgenerally a base 10, a top'l, and ends 12, these parts forming a device'of generally rectangular form which lends itself to ready inclosure Ysothat the several gear members `to be hereinafter described may ifdesired made-to run 1n 011.

Through the top land base 10 -aredength- 55 wise series ofv vertically.ralined openings in which grinding Vshafts 13 are mounted to both rotateand shift vertically, each of these shafts having a lower rigid valvestem engaging socket member 14 to connect with 60 the valve stems ofremovable valve cages which can of course be set into proper axialalineme'nt with the grinding shafts, and each of which grinding shaftsalso has at its upper V end al valve stem engaging socket. 15 which 651s connected thereto by a spring 16 forming in effect a flexible shaftcoupling so as to insure proper engagementv and operation with thevalves of removable cylinder heads'.v The socket members -14are thusbelow the 70 base 10 and the socket members 15 above the top 11 of theframe, andfbetween these portions of the frame, each of. the grindingshafts has a lower gear 17 secured thereto, and an upper collar 18 rigidtherewith above 7o the gear. I

Journaled lengthwise of the frame and through the frame ends 12 is alifting shaftv '19, which is both rotatable and lengthwise shiftable.This shaft has aeentral worm wheel 2O and a: series of longitudinallyspaced. cam members 21, the lifting shaft bem ing disposed slightlybelow the plane'of the several shaft colars 18 so that upon its.lengthwise shifting movement the cams21 85 may be moved into and out ofoperative osition beneath theseveral collars. Shar t 19 has at. one endavknob or handle 22 and is A by means .of this handle manually actuatedas to its'endwise movement intojan'd out'of 9'0 operative relation withthe` several grinding shafts. Disposed transversely of and around thelower central portion of the frame is a U-shaped bearing bracket 23, therear porltion of which isgextended upwardly 'and i forwardly to theframe top 411 as seen in Fig. 3,l and the forwardl and rear portions' ofwhich have journals for the forward and' rear ends4 of the mainloperating shaft 24, 100lr the latter of which has a pulley25 at itsforward end adapted to "receive a belt'from` any suitable source ofpower.

Around' a portion'of the 'shaft 24 betweenl the front and reariuprightsof the bracket 105 23 isa sleeve 26 having upon its forward end a' smallcam 27and having upon its rear end a gear wheel 28. .This sleeve `alsohas at an intermediate point a worm 29 into and out of *enga ement withwhich the worm,y wheelxOlof t ellifting shaft it) is shiftablerwhen thelatter shaft is moved endwise.

Adjacent to the gear 28, relatively smaller gear 30 is' secured on therear portion of the ing ya small Vgear 33 in mesh with the gear 28sothat it is thus obvious that the sleeve 26 is rotated at a' relativelyslow speed compared to that of the movement of the main shaft 2l fromwhich vit derives move-y ment and, by virtueof the relatively engaginwormand worm geen it is obvious that t e lifting sh'aft 19 will, withthese gear' engaged, be"rotatcd at still slower s ee i pAround the cam27 is a second larger cam 23a-.having a forwardly projecting pinextending from its iront'fa'ce and engaged hetween theA outer ends ofparallel crank arms' 36 projecting laterally from the main shaft 2liadjacent to the forward end of the sleeve 26. rl`his lar e' cam`rotating as it does around the smal cam 227 and controlled as to itsthrow by the di'erentially movable small cam, is disposed between and inmovable engagement with spaced ,uprights 37y of a sliding rack barS, thelatter being movable u on the base 10 of the frame, op-

posits. to t e severalgears 17 of the grind" ing shaft and with itstoothed edge 39 in engagement with the `several gears. This v .racli isguided in its Amovement by guide pins i0 upstanding from the frame basethrough lengthwise slots 41 4of the rack bar, and i lis thus obviousthat as to its particular movement, the grinding shaft oscillating rack38 is driven directly from the main shaft althoughf its stroke iscontrolled by the differentially movable small comtr'olling cain,thelatter being indirectly driven from theV main shaft through the reducinggears. lt is thus obvious that inoperation, the several grinding shaftsbeing prbperly connected with the stems of valves to be ground,

' either f their lower ends as with removable valve cages, or at theirupper ends as with valve-in-head motors, transmission of c power to themain shaft 24 instantly causes oscillation of each 'of the severalgrinding shafts, and thisv oscillation of each grinding shaft continuesuntil the respective cam 21 -of .the lifting shaft, the latter 'being inactive position, engages beneath its collarv J8 and lifts the shaft, atthe same time lift- 'ing-valve from its seat. As seen in'` Fig.. 1

it wil-lha noted that each grinding shaft in Vits 'elevated position isstill subjected to action by the rack bar 38, its gear 17 being stillengaged with the rack teeth 39,' and it is thus obvious that whileieahvalve is thus lifted, the relative actionbf .the difieren tially movablecams will continue to take place so that when the valve is again loweredthe respective cam of the lifting shaft passes frombeneath the same,the-.valve will be lowered upon its scat at a different point and asthis action continues to tak place intermittently, oscillation being .-cntinuously maintained between the intermittent shifting periods, thevalve will be. gradually shifted around the entire seat and the grind--ing properly and 'evenly accomplished.

.tween the. collars 18 kfor instance and the upper f rar'nebar or top11., the 'function oi which is so plain as to preclude the necessity of'further collaboration or a Idetail showing.

It is furthermore'obvious that while I- have shown grinding shafts in aseries of eight in Figs. 1 and 2, thisnumber may be varied by. eitherladdingzgto or subtractingv i therefrom, without materially changing orotherwiseletl'ecting the invention as herein disclosed.

It is obvious that the manual shifting of the lifting shaft 19 into andout of active position permits of ready prolongation of the oscillatingperiods between valve shift- .ing periods, which may be necessary ordesirable in some cases.

1. A'valve grinding mechanism including a plurality of rotatable andvertically shiftable grinding shafts, meansy for continuously'oscillating the 'said shafts in both their normal and vertically shiftedpositions, means for actuating sai oscillating means, means forintermittently shifting shafts, and'means for varying the stroke of uthe oscillating means during oscillation and vertical shiftingof theshafts as described.

each of thel 2. A valve grinding mechanism including sitions, includingconnectionsfor uniformly varying the extent of the oscillations duringthe oscillating and vertical shifting movement. i

3. A valve grinding mechanism including a plurality of rotatable andlengthwise shiftable grindingvsliafts, a means for intermittetlyshifting the said shaftslengthv. i

wise, and means having a variable stroke for continuously oscillatingthe said shafts in itheir normal and shifted positions, said named meansincluding gears carried by the grinding shafts,l a reciprocating rack 1nengagement with the several gears at all times, and a camactuating thesaid rack havxmg means to -automatically vary its throw during itsoperation.

4. A valve grinding mechanism including a plurality of rotatable andlengthwise shiftable grinding shafts, a means for in termittentlyshi'ftingvthe said shafts lengthwise, and means having a variable strokefor continuously oscillating the said shafts l in their normal andshifted positions, in-

cluding gears carried by the shafts, a rack actuating the gears, a camfor actuating the rack, a second cam on which the first cam is movable,and means for imparting differential movement to the two cams.

5. A valve grinding mechanism including a plurality of rotatable andlengthwise mova'ble grinding shafts, means for intermittently shiftingtheshafts in the direction of their lengths, and means for oscillatingthe said shafts, including means to conti'nuously.

and automatically vary the extent of oscillating movement during theiroscillating and verticallyA shifting operations as described. 1

6.l A valve grinding mechanism including l' a plurality of grindingshafts, to rotate and shift in the direction of their lengths, each 'ofsaid shafts having its opposite ends ex` posedrand provided with valvestem engag- -therewith and the valve stem ing means at both endsthereof, the said valve stem engaging means at .one end of each ofth'eshaftsbeing rigidly connected engaging means at the opposite endbeing. flexibly connected thereto as and for the purpose described.

7. -A valve grinding mechanism comprisingna plurality of grinding shaftsmountedto rotate and move lengthwise, means for shifting thesaid shaftsin the'direction of' their lengths, including a rotatable shaft having aplurality of grinding shaft engaging cams, said last mentioned shaftbeing shiftable lengthwise into and out of active position, means forcontinuously oscillating the said grinding shafts -in their normal andshifted positions, a'nd means for continuously varyingthe extent ofmovement of said last named means, as described.

8. A valve grinding mechanism comprising a plurality of rotatable andlengthwiseshiftable grinding shafts, each. provided with` a gear, a rackin engagement with the several gears, a cam actuating the said rack, adriving shaft having a direct connection with the said cam for actuating'the latter,

4acam around which said first named cam is rotatable, the grindingshafts in-the direction of thelr means for intermittently shiftinglengths, and operative connections between r the .driving shaftand theinner controlling cam including speed changing gears asdescribed.

- 9.. A valve grinding mechanism comprising a plurality of rotatable andlengthwise shiftable grinding shafts, each provided withl a' gear, arack in engagement with the several gears, a cam actuating the saidrack, adriving shaft having a direct connection with the said cam foractuating the latter, a Acam around which said first named cam is rotafrality of cam members for engagement withl the collars of the grindingshafts, a drive shaft, a rack actuating cam driven by the drive shaft, acontrollinflr cam around which the rack actuating cam is movable, asleeve around the drive shaft having a geared connection therewith, andupon which the controlling cam is mounted, and relatively vengaginggears carried by the said sleeve and the first mentioned cam carryingshaft.

.11. A'valve grinding mechanism includ-.l

ing a plurality of rotatable and lengthwise shiftable grinding shafts,each having a collar and a gear, a rack engaging the several grindingshaft gears, a shaft having a plurality of cam members for engagementwith the collars of the grinding shafts, a drive shaft, a rack actuatingcam driven by the drive shaft, a controlling cam around which the rackactuating cam is movable, a sleeve around the drive shaft having ageared c011- nection therewith, and upon which the con-- trolling cam ismounted, and relatively-engaging gears carrled by the sald sleeve andthe rst mentionedcam carrying shaft, said cam carrying shaft beingshiftable lengthwise to move its gear into and out of engagement withthe companion gear of the sleeve as described. 5

lIn testimony whereof he ailixes his signature.

' RALPH A. sHANTz.

